Starts with the famous 1920 race between Sir Barton and Man o' War - there are clips of part of the race out there on the web if you do a search.

From the sound of it, Man o' War's famous grandsire (the "Godolphin Arabian") caused a dramatic change in horse racing and breeding in Europe & America, so it's interesting to read this account of the life of the "father of the turf".

I do wonder if this author (Sea Star, Misty of Chincoteague, etc.) wrote any books that weren't about horses...